Vyshnepolskyi Y. Improving the quality of gas-turbine engine parts produced by selective laser sintering by means of diamond smoothing

The dissertation is devoted to the solution of an important scientific and applied task of expanding the scope of application of additive technologies and improving the quality of the surface layer of parts made of nickel alloys and alloys based on titanium aluminide obtained by selective laser sintering. For the first time, on the basis of a scientific approach, the use of diamond smoothing to strengthen these parts is substantiated. An evaluation of theoretical and practical approaches to the application of diamond smoothing to strengthen the structural stress concentrators of parts obtained using traditional and additive technologies, primarily selective laser sintering, was performed. The regularities of the formation of the quality of the surface layer of parts made of ЭП609-Ш alloy after diamond smoothing and its effect on fatigue resistance were determined. The regularities of the formation of the quality of the surface layer during strengthening of structural stress concentrators of parts made of INCONEL 718 alloy and titanium aluminide-based alloy OX45–3ODS have been established, based on a comprehensive study of the characteristics of the surface layer and the effect on them of the technological factors of diamond smoothing in relation to the change in geometry smoothing machine The influence of the residual porosity of the surface layer of parts made of an alloy based on titanium aluminide OX45–3ODS after selective laser sintering on the efficiency of diamond smoothing was determined. The value and regularities of the influence of the mode parameters of diamond smoothing on the residual porosity parameters were determined. Technological recommendations for the use of diamond smoothing (rational modes, processing conditions, tool geometry) and limitations of their use for processing structural stress concentrators have been developed to ensure high quality and productivity of the process of strengthening the surfaces of gas turbine engine parts.